projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| b75a7d8f A |
1 | /* |
| 2 | * %W% %E% | |
| 3 | * | |
| 4 | * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved | |
| 5 | * | |
| 6 | */ | |
| 7 | ||
| 8 | #include "LETypes.h" | |
| 9 | #include "LEFontInstance.h" | |
| 10 | #include "OpenTypeTables.h" | |
| 11 | #include "AnchorTables.h" | |
| 12 | #include "MarkArrays.h" | |
| 13 | #include "GlyphPositioningTables.h" | |
| 14 | #include "AttachmentPosnSubtables.h" | |
| 15 | #include "MarkToLigaturePosnSubtables.h" | |
| 16 | #include "GlyphIterator.h" | |
| 17 | #include "LESwaps.h" | |
| 18 | ||
| 19 | U_NAMESPACE_BEGIN | |
| 20 | ||
| 21 | LEGlyphID MarkToLigaturePositioningSubtable::findLigatureGlyph(GlyphIterator *glyphIterator) const | |
| 22 | { | |
| 23 | if (glyphIterator->prev()) { | |
| 24 | return glyphIterator->getCurrGlyphID(); | |
| 25 | } | |
| 26 | ||
| 27 | return 0xFFFF; | |
| 28 | } | |
| 29 | ||
| 30 | le_int32 MarkToLigaturePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const | |
| 31 | { | |
| 32 | LEGlyphID markGlyph = glyphIterator->getCurrGlyphID(); | |
| 33 | le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph); | |
| 34 | ||
| 35 | if (markCoverage < 0) { | |
| 36 | // markGlyph isn't a covered mark glyph | |
| 37 | return 0; | |
| 38 | } | |
| 39 | ||
| 40 | LEPoint markAnchor; | |
| 41 | const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset)); | |
| 42 | le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor); | |
| 43 | le_uint16 mcCount = SWAPW(classCount); | |
| 44 | ||
| 45 | if (markClass < 0 || markClass >= mcCount) { | |
| 46 | // markGlyph isn't in the mark array or its | |
| 47 | // mark class is too big. The table is mal-formed! | |
| 48 | return 0; | |
| 49 | } | |
| 50 | ||
| 51 | // FIXME: we probably don't want to find a ligature before a previous base glyph... | |
| 52 | GlyphIterator ligatureIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreBaseGlyphs*/)); | |
| 53 | LEGlyphID ligatureGlyph = findLigatureGlyph(&ligatureIterator); | |
| 54 | le_int32 ligatureCoverage = getBaseCoverage((LEGlyphID) ligatureGlyph); | |
| 55 | const LigatureArray *ligatureArray = (const LigatureArray *) ((char *) this + SWAPW(baseArrayOffset)); | |
| 56 | le_uint16 ligatureCount = SWAPW(ligatureArray->ligatureCount); | |
| 57 | ||
| 58 | if (ligatureCoverage < 0 || ligatureCoverage >= ligatureCount) { | |
| 59 | // The ligature glyph isn't covered, or the coverage | |
| 60 | // index is too big. The latter means that the | |
| 61 | // table is mal-formed... | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | le_int32 markPosition = glyphIterator->getCurrStreamPosition(); | |
| 66 | Offset ligatureAttachOffset = SWAPW(ligatureArray->ligatureAttachTableOffsetArray[ligatureCoverage]); | |
| 67 | const LigatureAttachTable *ligatureAttachTable = (const LigatureAttachTable *) ((char *) ligatureArray + ligatureAttachOffset); | |
| 68 | le_int32 componentCount = SWAPW(ligatureAttachTable->componentCount); | |
| 69 | le_int32 component = ligatureIterator.getMarkComponent(markPosition); | |
| 70 | ||
| 71 | if (component >= componentCount) { | |
| 72 | // should really just bail at this point... | |
| 73 | component = componentCount - 1; | |
| 74 | } | |
| 75 | ||
| 76 | const ComponentRecord *componentRecord = &ligatureAttachTable->componentRecordArray[component * mcCount]; | |
| 77 | Offset anchorTableOffset = SWAPW(componentRecord->ligatureAnchorTableOffsetArray[markClass]); | |
| 78 | const AnchorTable *anchorTable = (const AnchorTable *) ((char *) ligatureAttachTable + anchorTableOffset); | |
| 79 | LEPoint ligatureAnchor, markAdvance, pixels; | |
| 80 | ||
| 81 | anchorTable->getAnchor(ligatureGlyph, fontInstance, ligatureAnchor); | |
| 82 | ||
| 83 | fontInstance->getGlyphAdvance(markGlyph, pixels); | |
| 84 | fontInstance->pixelsToUnits(pixels, markAdvance); | |
| 85 | ||
| 86 | float anchorDiffX = ligatureAnchor.fX - markAnchor.fX; | |
| 87 | float anchorDiffY = ligatureAnchor.fY - markAnchor.fY; | |
| 88 | ||
| 89 | glyphIterator->setCurrGlyphBaseOffset(ligatureIterator.getCurrStreamPosition()); | |
| 90 | ||
| 91 | if (glyphIterator->isRightToLeft()) { | |
| 92 | glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY); | |
| 93 | } else { | |
| 94 | LEPoint ligatureAdvance; | |
| 95 | ||
| 96 | fontInstance->getGlyphAdvance(ligatureGlyph, pixels); | |
| 97 | fontInstance->pixelsToUnits(pixels, ligatureAdvance); | |
| 98 | ||
| 99 | glyphIterator->adjustCurrGlyphPositionAdjustment(anchorDiffX - ligatureAdvance.fX, anchorDiffY - ligatureAdvance.fY, -markAdvance.fX, -markAdvance.fY); | |
| 100 | } | |
| 101 | ||
| 102 | return 1; | |
| 103 | } | |
| 104 | ||
| 105 | U_NAMESPACE_END |